Shut-off clamp



FIG. 1 is a side view of the shut-off clamp showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a side view of the side opposite that shown in FIG. 1. 

The ornamental design for a shut-off clamp, as shown. 